You have bought a tuning file
From a file service, a portal or a tuner – for your own car or for your workshop. We check what is in it, before flashing or afterwards.
Check a tuning fileRemap and chip tuning check
Knowledge,
not belief.
Remap, chip tuning, ECU tuning – we analyse the changes to the engine or gearbox ECU software and explain in plain terms what effect they have. Above all: whether the limiters the manufacturer uses to protect the engine, turbocharger and gearbox from overheating and overload still take effect – and how much extra power is possible by calculation.
- Possible worldwide: with a file or with the removed ECU.
- You receive the report in your language.
What is your situation?
You want to know what has been changed on the vehicle
Send us a file or the removed ECU – from anywhere. We tell you what has been changed in the ECU software.
You only have a log file
The easiest thing to send. With the ECU’s software number, we compare it with the original file.
Log analysis onlyProcess
How it works
- Send dataUpload a tuning file, an original read or a log file in the enquiry form. If you have no file, send us the ECU and we will read it out.
- We analyseEvery change is counted, assigned and rated, the limiters first. From this we calculate how much extra power the ECU software allows. With log data, we also see what the engine does in operation.
- You receive the findings reportClear and factual, without business names and without judgement, with a report number for verification.
Limiters
Will it last?
That is the question most people come to us with – whether they own the vehicle or sold the file. Nobody can give a guarantee. But we show what matters: whether the limiters the manufacturer uses to protect the engine, turbocharger and gearbox from overheating and overload still take effect, and by how much they have been raised. With log data, we also see how close the engine comes to these limiters in operation.
What the limiters are for
These limiters exist for the components: they reduce power before the pistons, turbocharger, catalytic converter or clutch are damaged – when things get too hot, the turbocharger spins too fast or combustion becomes unclean. Extra power on its own rarely causes damage. Damage occurs when these limiters are missing.
Anyone who wants more power runs into exactly these limiters. So some raise them as well, switch them off or change the calculation they are based on. You notice none of this on the dyno or on a test drive.
One of four results for each limiter
- unchanged
- raised, and by how much
- switched off
- calculation changed
From the sample report
The calculation model for the exhaust gas temperature had been lowered by 5% across the entire range. As a result, the control unit calculated temperatures up to 64 K cooler than they actually were.
At the same time, the threshold for enrichment had been lowered from 980 to 900 °C: enrichment therefore started slightly earlier, while everything else that depends on the calculated temperature saw exhaust gas that was too cool. You notice none of this while driving.
Sample report
What a report looks like
An extract from a real analysis, anonymised. A purchased tune for an Audi RS5, stated as 530 PS and 800 Nm.
- confirmedproven against the factory software and the map description
- likelyvalues and patterns fit, the full description is missing
- openchanged, purpose cannot be determined – still listed
TUNING-CHECK
Frankfurt (Oder)
Tuning-Check findings report
- No.
- TC-2026-0001
- Date
- 21 Sep 2026
- Level
- Analysis of the file with log data
- Vehicle
- Audi RS5 (B9), 2.9 TFSI
- ECU
- Bosch MG1CS002 (MDG1) · part number 8W0 907 551 K
Finding: modified. 5,677 bytes differ from the factory software. All of them are assigned, spread across 22 topics.
| Area | Stock | Now | Rating |
|---|---|---|---|
| Limiters against overload | |||
| Exhaust gas temperature, calculation model (675 cells) | factory values | all × 0.95, across the entire range – calculates up to 64 K too cool | confirmed |
| Charge reduction on pre-ignition | active | no reduction at 3,000 rpm and above | confirmed |
| Turbo speed and pressure ratio limiter | dependent on air pressure and intake air temperature | at normal air pressure slightly lower up to about 50 °C, higher above that and at altitude (up to +8%) | confirmed |
| Torque, calculation model | load axis up to 230% | stretched to 270% – calculates up to 15% too low | confirmed |
Scope
Three levels
Not every question needs the full analysis. We clarify which level is possible before you place the order.
Quick check of the file
Factory software or modified? Which areas, whether the limiters still take effect, whether fault codes have been switched off and whether the checksums are correct. Enough for a buying decision.
Price incl. 19% VAT€130
Analysis of the file
In addition: every change named and explained, which fault codes have been switched off, what the software permits by calculation, and where it contains errors.
Price incl. 19% VAT€250
Analysis of the file with log data
In addition, we analyse recordings made while driving (log data). You then see, alongside the calculation, how the engine really behaves.
Price incl. 19% VAT€320
Single item · without a read-out
Log analysis only, without the file
The easiest thing to send: a log file from a drive. We analyse it on its own – with a report and report number. With the ECU’s software number, we also compare it with the original file. It shows how the engine behaves in this recording, not what has been changed in the ECU software.
Price incl. 19% VAT€90
How it works
Report number
Check that a report is genuine
Every report carries a number, for example TC-2026-0001. If someone shows you a report, you can check here whether it was issued by us.
FormatTC-YYYY-NNNN
On road approval: The report states what is in the ECU software. Whether a vehicle with this software is approved for use on public roads depends on the regulations of the country concerned and is decided by the authority responsible there. Modified engine or gearbox ECU software is not automatically approved without the inspection required there.
Enquiry
Request a check
Tell us the vehicle, the reason and whether you will send a file, a log file or the ECU. We reply in your language and tell you in advance which level is possible.
Request a check
or write directly to info@tuningcheck.de
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